表面等离子体耦合宽频上转换增强TiO2光催化性能研究

项目名称： 表面等离子体耦合宽频上转换增强TiO2光催化性能研究

项目编号： No.21306150

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 化学工业

项目作者： 刘恩周

作者单位： 西北大学

项目金额： 25万元

中文摘要： 针对TiO2光催化剂对太阳光利用率低的问题，拟将局域表面等离子体效应和非稀土上转换发光结合，构建表面等离子体耦合宽频上转换新型纳米TiO2光催化体系，通过光频转换与同步增强，提高TiO2光催化效率。旨在设计合成系列纳米核-壳结构光催化剂，以提高光催化还原CO2量子效率为目标，优化反应条件，筛选构建高效TiO2光催化体系。通过制备方法的探索，实现对材料组成、结构与性能的调控，重点研究表面等离子体与上转换发光的耦合机制，核-壳结构催化剂的光能吸收、转换、利用效率，及光催化反应机理。借助荧光光谱和理论计算等手段，探索发光机制和荧光增强机理，弄清表面等离子体与荧光增强、能量传递之间的影响因素，最终建立荧光增强耦合机制模型和光能转换利用模型，获得太阳能光频调控新策略。本课题将为光能利用和光催化体系设计提供新的学术思路。

中文关键词： 光催化；局域表面等离子体共振；上转换发光；光催化还原CO2；TiO2纳米薄膜

英文摘要： Aiming at the low utilization efficiency of solar light by the TiO2 photocatalyst, the combination of localized surface plasmon resonance effect and rare-earth free upconversion emission is proposed to improve the photocatalytic efficiency of TiO2 by construction a novel photocatalysis system based on the coupling of surface plasmon and wide-frequency upconversion emission, which could achieve the optical frequency conversion and synchronous fluorescent enhancement. The purpose of this study is to design and synthesis a series of nano photocatalysts with core-shell structure, select and construct of efficient TiO2 photocatalysis system to improve the quantum efficiency of photocatalytic reduction of CO2 by the optimization of reaction conditions. The effort will be devote to the controllable preparation of metal particle and upconversion materials with nano-structure, and regulating their element components, structures and properties by exploring effective synthesis methods. In addition, the coupling between surface plasmon and upconversion emission, the efficiencies for light absorption, conversion and utilization, the photocatalysis mechanism will be analyzed in detail. Meanwhile, the mechanism of upconversion emission and fluorescence enhancement will be investigated under the assistance of fluorescence spe

英文关键词： photocatalysis；localized surface plasmon resonance；upconversion luminescence；photocatalytic reduction of CO2；TiO2 nanofilms